fix: 4 column layout for about section

src/pages/About.module.css

@@ -73,6 +73,12 @@
   margin: 0 auto;
 }
 
+@media (min-width: 768px) {
+  .techGrid {
+    grid-template-columns: repeat(4, 1fr);
+  }
+}
+
 .techCard {
   display: flex;
   flex-direction: column;